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Fine-regolith production on asteroids controlled by rock porosity

机译：由岩石孔隙率控制的小行星上的细糖性生产

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摘要

Spacecraft missions have observed regolith blankets of unconsolidated subcentimetre particles on stony asteroids~(1-3). Telescopic data have suggested the presence of regolith blankets also on carbonaceous asteroids, including (101955) Bennu~(4)and (162173) Ryugu~(5). However, despite observations of processes that are capable of comminuting boulders into unconsolidated materials, such as meteoroid bombardment~(6,7)and thermal cracking~(8), Bennu and Ryugu lack extensive areas covered in subcentimetre particles~(7,9). Here we report an inverse correlation between the local abundance of subcentimetre particles and the porosity of rocks on Bennu. We interpret this finding to mean that accumulation of unconsolidated subcentimetre particles is frustrated where the rocks are highly porous, which appears to be most of the surface~(10). The highly porous rocks are compressed rather than fragmented by meteoroid impacts, consistent with laboratory experiments~(11,12), and thermal cracking proceeds more slowly than in denser rocks. We infer that regolith blankets are uncommon on carbonaceous asteroids, which are the most numerous type of asteroid~(13). By contrast, these terrains should be common on stony asteroids, which have less porous rocks and are the second-most populous group by composition~(13). The higher porosity of carbonaceous asteroid materials may have aided in their compaction and cementation to form breccias, which dominate the carbonaceous chondrite meteorites~(14).
机译：航天器任务已经观察到石斑化毛细管颗粒上的石斑块毯子在石左右上的颗粒〜（1-3）。伸缩数据尚建立了含有碳质小行星的凝固毯的存在，包括（101955）Bennu〜（4）和（162173）Ryugu〜（5）。然而，尽管观察能够将巨石粉碎成未溶解的材料的过程，例如菱形轰击〜（6,7）和热裂解〜（8），Bennu和Ryugu缺乏沉默的颗粒覆盖的广泛区域〜（7,9） 。在这里，我们报告了局部大量颗粒的局部丰富与Bennu上岩石孔隙率之间的反向相关性。我们解释了这一发现，意味着不核化的子心电图颗粒的积累是令人沮丧的，其中岩石高度多孔，这似乎是大多数表面〜（10）。高度多孔岩石被压缩而不是通过环形抗冲击的碎片，与实验室实验一致〜（11,12），并且热裂化比密度岩体更慢。我们推G碳质小行星上的颗粒橡皮布罕见，这是最多类型的小行星〜（13）。相比之下，这些地形应该是常见的，它具有较少的多孔岩石，并且是由组合物的第二个人口般的群体〜（13）。碳质天然材料的较高孔隙率可以在它们的压实和胶结中辅以形成Breccias，其主导含碳含有碳质陨石〜（14）。

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  • 来源
    《Nature》 |2021年第7879期|49-52|共4页
  • 作者

    S Cambioni; M Delbo; G Poggiali; C Avdellidou; A J Ryan; J D P Deshapriya; E Asphaug; R-L Ballouz; M A Barucci; C A Bennett; W F Bottke; J R Brucato; K N Burke; E Cloutis; D N DellaGiustina; J P Emery; B Rozitis; K J Walsh; D S Lauretta;

  • 作者单位

    Lunar and Planetary Laboratory University of Arizona|Division of Geological and Planetary Sciences California Institute of Technology;

    Université Côte d'Azur Observatoire de la Côte d'Azur CNRS Laboratoire Lagrange;

    INAF - Osservatorio Astrofisico di Arcetri;

    Université Côte d'Azur Observatoire de la Côte d'Azur CNRS Laboratoire Lagrange;

    Lunar and Planetary Laboratory University of Arizona;

    LESIA Observatoire de Paris Université PSL CNRS Sorbonne Université Univ. Paris Diderot Sorbonne Paris Cité;

    Lunar and Planetary Laboratory University of Arizona;

    Lunar and Planetary Laboratory University of Arizona;

    LESIA Observatoire de Paris Université PSL CNRS Sorbonne Université Univ. Paris Diderot Sorbonne Paris Cité;

    Lunar and Planetary Laboratory University of Arizona;

    Southwest Research Institute;

    INAF - Osservatorio Astrofisico di Arcetri;

    Lunar and Planetary Laboratory University of Arizona;

    Department of Geography University of Winnipeg;

    Lunar and Planetary Laboratory University of Arizona;

    Department of Astronomy and Planetary Science Northern Arizona University;

    School of Physical Sciences The Open University;

    Southwest Research Institute;

    Lunar and Planetary Laboratory University of Arizona;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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